/* ============ NEO-BRUTALISM THEME ============ */
@import url('https://fonts.googleapis.com/css2?family=Archivo+Black&family=Space+Grotesk:wght@400;500;600;700&family=JetBrains+Mono:wght@400;700&display=swap');

:root {
  --ink: #000000;
  --paper: #FFFEF2;
  --paper-2: #F4F1E8;
  --yellow: #FFE84D;
  --pink: #FF6EC7;
  --blue: #4D9FFF;
  --green: #A8E85C;
  --orange: #FF8C3D;
  --red: #FF4747;
  --purple: #C7A6FF;
  --border: 3px solid #000;
  --border-thick: 4px solid #000;
  --shadow: 6px 6px 0 #000;
  --shadow-lg: 8px 8px 0 #000;
  --shadow-sm: 4px 4px 0 #000;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  font-family: 'Space Grotesk', 'Pretendard', -apple-system, sans-serif;
  color: var(--ink);
  background: var(--paper);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  /* noise texture */
  background-image:
    radial-gradient(circle at 1px 1px, rgba(0,0,0,0.05) 1px, transparent 0);
  background-size: 24px 24px;
}

.display { font-family: 'Archivo Black', 'Space Grotesk', sans-serif; }
.mono { font-family: 'JetBrains Mono', monospace; }

/* ============ HEADER ============ */
header {
  position: sticky;
  top: 0;
  background: var(--paper);
  border-bottom: var(--border-thick);
  z-index: 999;
}

.nav-wrap {
  max-width: 1400px;
  margin: 0 auto;
  padding: 16px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--ink);
  font-family: 'Archivo Black', sans-serif;
  font-size: 22px;
  letter-spacing: -0.5px;
}

.brand-mark {
  width: 36px;
  height: 36px;
  background: var(--yellow);
  border: var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  transform: rotate(-4deg);
  transition: transform 0.2s;
}

.brand:hover .brand-mark { transform: rotate(4deg); }

.menu {
  display: flex;
  align-items: center;
  gap: 6px;
  list-style: none;
}

.menu > li > a {
  display: inline-block;
  padding: 10px 16px;
  color: var(--ink);
  text-decoration: none;
  font-weight: 600;
  font-size: 15px;
  border: 2px solid transparent;
  transition: all 0.12s;
}

.menu > li > a:hover {
  background: var(--ink);
  color: var(--yellow);
}

.menu-cta {
  background: var(--pink) !important;
  border: var(--border) !important;
  padding: 10px 18px !important;
  font-weight: 700 !important;
  box-shadow: var(--shadow-sm);
  margin-left: 6px;
}

.menu-cta:hover {
  transform: translate(-2px, -2px);
  box-shadow: 6px 6px 0 #000;
  background: var(--pink) !important;
  color: var(--ink) !important;
}

/* Dropdown */
.has-sub { position: relative; }

.submenu {
  position: absolute;
  top: calc(100% + 10px);
  left: 50%;
  transform: translateX(-50%) translateY(-4px);
  min-width: 260px;
  background: var(--paper);
  border: var(--border);
  box-shadow: var(--shadow);
  padding: 8px;
  opacity: 0;
  visibility: hidden;
  transition: all 0.15s;
  list-style: none;
}

.has-sub:hover .submenu {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
}

.submenu a {
  display: block;
  padding: 10px 14px;
  color: var(--ink);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  border: 2px solid transparent;
}

.submenu a:hover {
  background: var(--ink);
  color: var(--yellow);
}

.hamburger {
  display: none;
  background: var(--paper);
  border: var(--border);
  width: 44px;
  height: 44px;
  cursor: pointer;
  box-shadow: var(--shadow-sm);
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 4px;
  padding: 0;
}

.hamburger span {
  display: block;
  width: 20px;
  height: 2.5px;
  background: var(--ink);
  transition: 0.2s;
}

.hamburger.active span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.hamburger.active span:nth-child(2) { opacity: 0; }
.hamburger.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ============ PAGE HERO ============ */
.page-hero {
  background: var(--yellow);
  border-bottom: var(--border-thick);
  padding: 60px 24px 80px;
  position: relative;
  overflow: hidden;
}

.page-hero::before {
  content: '';
  position: absolute;
  top: 20px;
  right: -40px;
  width: 180px;
  height: 180px;
  background: var(--pink);
  border: var(--border);
  transform: rotate(15deg);
  z-index: 0;
}

.page-hero::after {
  content: '';
  position: absolute;
  bottom: -60px;
  left: -60px;
  width: 200px;
  height: 200px;
  background: var(--blue);
  border: var(--border);
  border-radius: 50%;
  z-index: 0;
}

.page-hero-inner {
  max-width: 900px;
  margin: 0 auto;
  position: relative;
  z-index: 1;
}

.crumb {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 24px;
  background: var(--paper);
  border: 2px solid var(--ink);
  padding: 6px 12px;
  text-transform: uppercase;
}

.crumb a { color: var(--ink); text-decoration: none; }
.crumb a:hover { text-decoration: underline; }
.crumb-sep { opacity: 0.5; }

.eyebrow {
  display: inline-block;
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  font-weight: 700;
  background: var(--ink);
  color: var(--yellow);
  padding: 6px 14px;
  letter-spacing: 2px;
  text-transform: uppercase;
  margin-bottom: 20px;
  transform: rotate(-1deg);
}

.page-hero h1 {
  font-family: 'Archivo Black', sans-serif;
  font-size: clamp(2.4rem, 6vw, 4.6rem);
  line-height: 0.95;
  letter-spacing: -2px;
  color: var(--ink);
  margin-bottom: 20px;
  text-transform: uppercase;
}

.page-hero h1 .hl {
  background: var(--ink);
  color: var(--yellow);
  padding: 0 14px;
  display: inline-block;
  transform: rotate(-1deg);
}

.page-hero-desc {
  font-size: 18px;
  line-height: 1.6;
  max-width: 640px;
  font-weight: 500;
  color: var(--ink);
  background: var(--paper);
  border: var(--border);
  padding: 18px 22px;
  box-shadow: var(--shadow-sm);
}

/* ============ ARTICLE ============ */
.article {
  padding: 80px 24px;
}

.article-inner {
  max-width: 820px;
  margin: 0 auto;
}

.toc {
  background: var(--pink);
  border: var(--border-thick);
  padding: 24px 28px;
  margin-bottom: 56px;
  box-shadow: var(--shadow-lg);
  position: relative;
}

.toc::before {
  content: '';
  position: absolute;
  top: -12px;
  right: 20px;
  background: var(--ink);
  color: var(--yellow);
  padding: 4px 10px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  font-weight: 700;
  content: '// INDEX';
}

.toc-label {
  font-family: 'Archivo Black', sans-serif;
  font-size: 16px;
  letter-spacing: 1px;
  margin-bottom: 16px;
  text-transform: uppercase;
  color: var(--ink);
}

.toc ol {
  list-style: none;
  counter-reset: toc;
}

.toc li {
  counter-increment: toc;
  padding: 8px 0;
  font-size: 15px;
  font-weight: 600;
  border-bottom: 2px solid rgba(0,0,0,0.15);
  display: flex;
  align-items: center;
  gap: 12px;
}

.toc li:last-child { border-bottom: none; }

.toc li::before {
  content: counter(toc, decimal-leading-zero);
  font-family: 'JetBrains Mono', monospace;
  color: var(--ink);
  font-weight: 700;
  background: var(--paper);
  border: 2px solid var(--ink);
  padding: 2px 8px;
  font-size: 13px;
}

.toc a {
  color: var(--ink);
  text-decoration: none;
  flex: 1;
}

.toc a:hover { text-decoration: underline; text-underline-offset: 3px; }

/* Article Body */
.body h2 {
  font-family: 'Archivo Black', sans-serif;
  font-size: 32px;
  line-height: 1.1;
  letter-spacing: -1px;
  color: var(--ink);
  margin: 60px 0 20px;
  text-transform: uppercase;
  padding-left: 16px;
  border-left: 8px solid var(--ink);
}

.body h2:first-child { margin-top: 0; }

.body h3 {
  font-size: 20px;
  font-weight: 700;
  color: var(--ink);
  margin: 32px 0 12px;
  text-transform: uppercase;
  letter-spacing: -0.3px;
}

.body p {
  font-size: 16.5px;
  color: var(--ink);
  line-height: 1.75;
  margin-bottom: 18px;
  font-weight: 500;
}

.body ul, .body ol {
  padding-left: 24px;
  margin-bottom: 20px;
}

.body li {
  font-size: 16px;
  line-height: 1.75;
  margin-bottom: 8px;
  font-weight: 500;
}

.body strong {
  background: var(--yellow);
  padding: 0 4px;
  font-weight: 700;
  border: 2px solid var(--ink);
  display: inline;
  line-height: 1.4;
}

/* Callout Box */
.callout {
  padding: 24px 28px;
  border: var(--border-thick);
  margin: 32px 0;
  font-size: 15.5px;
  line-height: 1.7;
  box-shadow: var(--shadow);
  font-weight: 500;
  position: relative;
}

.callout.tip { background: var(--green); }
.callout.warn { background: var(--orange); }
.callout.alert { background: var(--red); color: var(--paper); }
.callout.alert strong { background: var(--yellow); color: var(--ink); border-color: var(--ink); }

.callout-title {
  display: block;
  font-family: 'Archivo Black', sans-serif;
  font-size: 14px;
  margin-bottom: 10px;
  text-transform: uppercase;
  letter-spacing: 1px;
}

/* Info Grid */
.info-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
  margin: 32px 0;
}

.info-cell {
  background: var(--paper);
  border: var(--border-thick);
  padding: 24px;
  box-shadow: var(--shadow);
  transition: all 0.15s;
}

.info-cell:nth-child(4n+1) { background: var(--blue); }
.info-cell:nth-child(4n+2) { background: var(--yellow); }
.info-cell:nth-child(4n+3) { background: var(--pink); }
.info-cell:nth-child(4n+4) { background: var(--green); }

.info-cell:hover {
  transform: translate(-2px, -2px);
  box-shadow: 8px 8px 0 #000;
}

.info-num {
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  font-weight: 700;
  background: var(--ink);
  color: var(--paper);
  padding: 3px 8px;
  display: inline-block;
  margin-bottom: 12px;
  letter-spacing: 1px;
}

.info-cell h4 {
  font-family: 'Archivo Black', sans-serif;
  font-size: 18px;
  margin-bottom: 8px;
  text-transform: uppercase;
  letter-spacing: -0.3px;
}

.info-cell p {
  font-size: 14px !important;
  margin: 0 !important;
  line-height: 1.55 !important;
  font-weight: 500;
}

/* Clean Table */
.clean-table {
  width: 100%;
  border-collapse: collapse;
  margin: 32px 0;
  font-size: 15px;
  background: var(--paper);
  border: var(--border-thick);
  box-shadow: var(--shadow);
}

.clean-table th {
  padding: 14px 16px;
  background: var(--ink);
  color: var(--yellow);
  text-align: left;
  font-family: 'Archivo Black', sans-serif;
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 1px;
  border-bottom: var(--border);
}

.clean-table td {
  padding: 14px 16px;
  border-bottom: 2px solid var(--ink);
  color: var(--ink);
  font-weight: 500;
}

.clean-table tr:last-child td { border-bottom: none; }

.clean-table td:first-child { font-weight: 700; }

.clean-table tbody tr:nth-child(even) { background: rgba(0,0,0,0.03); }

/* Check List */
.check-list {
  list-style: none !important;
  padding: 0 !important;
  margin: 28px 0;
}

.check-list li {
  padding: 16px 20px 16px 58px !important;
  background: var(--paper);
  border: var(--border);
  margin-bottom: 10px;
  position: relative;
  box-shadow: var(--shadow-sm);
  font-weight: 500;
  transition: all 0.12s;
}

.check-list li:hover {
  transform: translate(-2px, -2px);
  box-shadow: 6px 6px 0 #000;
  background: var(--yellow);
}

.check-list li::before {
  content: '✓';
  position: absolute;
  left: 16px;
  top: 50%;
  transform: translateY(-50%);
  width: 28px;
  height: 28px;
  background: var(--ink);
  color: var(--green);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: 'Archivo Black', sans-serif;
  font-size: 16px;
  font-weight: 900;
}

/* Q&A */
.qna {
  list-style: none !important;
  padding: 0 !important;
}

.qna-card {
  background: var(--paper);
  border: var(--border-thick);
  margin-bottom: 16px !important;
  padding: 0 !important;
  box-shadow: var(--shadow);
  transition: all 0.15s;
}

.qna-card:hover {
  transform: translate(-3px, -3px);
  box-shadow: 9px 9px 0 #000;
}

.qna-card::before { display: none !important; }

.qna-q {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  padding: 20px 24px;
  background: var(--ink);
  color: var(--paper);
  border-bottom: var(--border);
}

.qna-q-mark {
  flex-shrink: 0;
  width: 32px;
  height: 32px;
  background: var(--yellow);
  color: var(--ink);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: 'Archivo Black', sans-serif;
  font-size: 16px;
  border: 2px solid var(--yellow);
}

.qna-q-text {
  font-family: 'Archivo Black', sans-serif;
  font-size: 17px;
  line-height: 1.35;
  letter-spacing: -0.3px;
  text-transform: uppercase;
  color: var(--paper);
  padding-top: 4px;
}

.qna-a {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  padding: 22px 24px;
}

.qna-a-mark {
  flex-shrink: 0;
  width: 32px;
  height: 32px;
  background: var(--pink);
  color: var(--ink);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: 'Archivo Black', sans-serif;
  font-size: 16px;
  border: 2px solid var(--ink);
}

.qna-a-text {
  color: var(--ink);
  font-size: 15.5px;
  line-height: 1.75;
  font-weight: 500;
  padding-top: 4px;
}

/* CTA Block */
.cta-block {
  background: var(--ink);
  padding: 40px 32px;
  border: var(--border-thick);
  color: var(--paper);
  margin: 60px 0 20px;
  position: relative;
  box-shadow: var(--shadow-lg);
}

.cta-block::before {
  content: '';
  position: absolute;
  top: -20px;
  left: 24px;
  background: var(--yellow);
  border: var(--border);
  padding: 4px 14px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  font-weight: 700;
  content: 'TAKE ACTION →';
  color: var(--ink);
}

.cta-block h3 {
  font-family: 'Archivo Black', sans-serif;
  font-size: 28px;
  line-height: 1.15;
  margin-bottom: 12px;
  text-transform: uppercase;
  letter-spacing: -0.5px;
  color: var(--paper);
}

.cta-block p {
  color: var(--paper) !important;
  margin-bottom: 22px !important;
  font-size: 15.5px !important;
  font-weight: 500;
  opacity: 0.85;
}

.cta-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--yellow);
  color: var(--ink);
  padding: 14px 26px;
  text-decoration: none;
  font-family: 'Archivo Black', sans-serif;
  font-size: 15px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  border: var(--border);
  box-shadow: 5px 5px 0 var(--paper);
  transition: all 0.15s;
}

.cta-btn:hover {
  transform: translate(-3px, -3px);
  box-shadow: 8px 8px 0 var(--paper);
  background: var(--pink);
}

/* Related */
.related {
  margin-top: 72px;
  padding-top: 40px;
  border-top: var(--border-thick);
}

.related-title {
  font-family: 'Archivo Black', sans-serif;
  font-size: 24px;
  text-transform: uppercase;
  letter-spacing: -0.5px;
  margin-bottom: 22px;
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 16px;
}

.related-card {
  background: var(--paper);
  border: var(--border-thick);
  padding: 24px;
  text-decoration: none;
  color: inherit;
  display: block;
  box-shadow: var(--shadow);
  transition: all 0.15s;
}

.related-card:hover {
  transform: translate(-3px, -3px) rotate(-1deg);
  box-shadow: 9px 9px 0 #000;
  background: var(--blue);
}

.related-tag {
  display: inline-block;
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  font-weight: 700;
  background: var(--ink);
  color: var(--paper);
  padding: 3px 10px;
  margin-bottom: 12px;
  letter-spacing: 1px;
}

.related-card h4 {
  font-family: 'Archivo Black', sans-serif;
  font-size: 18px;
  margin-bottom: 8px;
  line-height: 1.2;
  text-transform: uppercase;
  letter-spacing: -0.3px;
}

.related-card p {
  font-size: 13.5px;
  font-weight: 500;
}

/* Footer */
footer {
  background: var(--ink);
  color: var(--paper);
  padding: 60px 24px 32px;
  font-size: 14px;
  line-height: 1.7;
  border-top: var(--border-thick);
}

.footer-wrap {
  max-width: 1400px;
  margin: 0 auto;
}

.footer-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 24px;
  margin-bottom: 40px;
  padding-bottom: 32px;
  border-bottom: 2px dashed rgba(255,254,242,0.2);
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: 'Archivo Black', sans-serif;
  font-size: 24px;
  color: var(--paper);
  text-transform: uppercase;
}

.footer-links {
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
}

.footer-links a {
  color: var(--paper);
  text-decoration: none;
  font-weight: 600;
  font-size: 14px;
}

.footer-links a:hover { color: var(--yellow); text-decoration: underline; }

.footer-notice {
  font-size: 12px;
  color: rgba(255,254,242,0.65);
  font-family: 'JetBrains Mono', monospace;
}

.footer-notice p { margin-bottom: 4px; }
.footer-notice strong { color: var(--yellow); }

.footer-copy {
  margin-top: 32px;
  padding-top: 20px;
  border-top: 2px dashed rgba(255,254,242,0.2);
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  color: rgba(255,254,242,0.5);
  text-align: center;
  letter-spacing: 1px;
}

/* ============ RESPONSIVE ============ */
@media (max-width: 900px) {
  .menu {
    position: fixed;
    top: 77px;
    right: -100%;
    width: 100%;
    height: calc(100vh - 77px);
    background: var(--paper);
    flex-direction: column;
    align-items: stretch;
    padding: 24px;
    gap: 8px;
    transition: right 0.3s;
    border-top: var(--border-thick);
    overflow-y: auto;
  }
  .menu.active { right: 0; }
  .menu > li > a {
    padding: 14px 16px;
    font-size: 16px;
    border: var(--border);
    background: var(--paper);
  }
  .submenu {
    position: static;
    transform: none;
    opacity: 1;
    visibility: visible;
    box-shadow: none;
    padding: 6px;
    margin-top: 6px;
    margin-left: 20px;
    min-width: 0;
    background: var(--paper-2);
  }
  .submenu a { padding: 10px 14px; font-size: 14px; }
  .menu-cta {
    margin-left: 0 !important;
    margin-top: 8px;
    text-align: center;
  }
  .hamburger { display: flex; }
}

@media (max-width: 640px) {
  .nav-wrap { padding: 14px 16px; }
  .page-hero { padding: 40px 20px 60px; }
  .article { padding: 60px 20px; }
  .body h2 { font-size: 26px; }
  .cta-block { padding: 32px 24px; }
  .qna-q-text { font-size: 15px; }
  .qna-a-text { font-size: 14.5px; }
  .footer-top { flex-direction: column; }
}